So, some more information about higher beings.
I think everyone understands that most of these beings have manifestations in the higher domain not because of their own evolution, but because of the support of other higher beings. This applies to most of Ushiromiya family and to Rika as well. They have all the same abilities and power, but in fact they have the status of pieces on some personal board, and they will disappear along with the owner of their board. For example, you can remember how Beatrice's whole world disappeared at the end of the third episode, when she denied herself, and even Battler disappeared with her, because he was a part of her world.
The process of evolution itself is inspired by some inner spiritual changes that alienate human from human nature.
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And yes, this is about turning into a higher world being (õ©èõ¢ìÒü«õ©ûþòîÒü«Õ¡ÿÕ£¿), not just into "something different", as it is written on my scan.
The catalyst for this process in Rika's case was her time loop travel. In Kotarou (Rewrite protagonst)'s case it was increase of intelligence through a special ability and control system of the world. In Yasu's case it was her tragedy and madness.
I think it is not necessary to explain that the manifestations of higher beings have nothing to do with their material bodies from lower kakeras.
Even in the case of humans, the will is identified with life, although this is only a metaphor, but in the case of higher beings, such metaphors are literal things.
They exist while they have the will andthey die when they lost their motivation for life. Therefore, boredom is poison to them.
When higher beings define themselves, they incarnate directly from nothingness.
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More precisely, not just from nothingness, but from being of nothingness (ÞÖÜþäíÒü«Õ¡ÿÕ£¿). This is the most fundamental nature of higher beings. This is their form when they do not define themselves.
I think everyone understands that nothingness is a common background for worlds of all layers and domains. Beings of nothingness are no longer associated with boards. It may seem that then they are much stronger than normal manifestations of higher beings. However, such an abstract nature helps only for Regenerationn; it does not allow jumping above the head for one simple reason.
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Higher beings who are limited by territories/boards simply cannot be incarnated somewhere outside of their boards. They are locked inside such catboxes/sets of possibilities.
As long as the process of thinking, the will and the motivation is there, revival is possible. Nevertheless, nothingness is also oblivion and it puts pressure on the mind of even the living higher beings, not to mention the dead ones, and therefore the most difficult thing for them will be to remember themselves after a long death.
Powerful attacks, especially conceptual ones, can hold back the ability to determine one's form, and thus prevent the very possibility of existence.
The Truth attacks that can disprove someone's existence are particularly effective if the victim does not have counter-arguments that will allow to define self (at least from own perspective).
In addition, adaptation to higher existence does not occur instantaneously for those who used to be human before. Even to understand some obvious things for higher beings, it will take some time (well, there is no concept of time, but I hope you understand me).